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I use mobile 1...lot of people will use Royal Purple as well.
 

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I use a specialty synthetic in both vehicles from a non-supporting vendor, so that's as much as I can say.
 

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In warm So Cal I use the 15-50 mobil 1 fully synthetic per the TSB by DCX. If you plan on keeping your srt8 in good condition and getting the highest resale by a car enthusiast you'll want to stick with factory recommendations.
 

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amsoil

will(nycsrt8) uses the same. It's arguably the best.
 
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